the ntsb trying to get to the bottom of an engineering mystery. remember, the faa allowed boeing to use lithium ion batteries. the light fuel-efficient plane is supposed to save airlines a ton of money on long-haul flights. no dreamliners in the air right now. boeing says we're working this issue tirelessly in cooperation with customers and the appropriate regulatory and investigative authorities. it is still a mystery. the ntsb laying out this charred battery,ingi reporters what they are digging into. >> richard quest is in davos. beautiful behind you. tell us about the presser? pretty remarkable. battery charred, on the table. >> oh. the pictures are absolutely remarkable of what the battery looked like and not only that but also the damage that took place to the electronics bay at the same time when that fire broke out. but the serious part in all of this is what the ntsb chairman debra herdsman said. she basically made it clear there had been a fire, sign of a thermal runaway this is when the battery starts getting so hot it keeps getting hott